Interferance Report Error

Forum|Forum|10 years ago
August 5, 2015
3 replies
6157 views

Creo 2 Parametric, M160

When I do an global interference on my assy, two parts report a very high interference, about 7.5 cubic inches. There is no clear interferance between the parts. This value is consistent between a global interference or pairs clearance checks ,whether at the top level or at the sub assy level. I created a cut out of one part into the other, which should eliminate all interferences and it still reports the same value. In fact, it turns out the volume reported is exactly equal to the volume of the two parts together. For some reason Creo thinks they fully overlap when they clearly do not.

Has anyone seen this before and have a work around? My concern is trusting the analysis in other areas, or missing and actual interference between these two parts because I assume this is just a glitch.

General

Best answer by TomU

Doug Schaefer‌, I just retested this issue in CP3 M080 and it appears to now be resolved. Tech support has never updated my case, so I just emailed them to find out what build it was corrected in. I'll let you know...

Chris3

21-Topaz I

This may sound silly, but are you in an exploded view or a drawing snapshot? IE maybe the parts really are overlapped?

Have you tried putting them in a brand new assembly with a distance of 100 units apart?

D

dgschaefer

Author

21-Topaz II

No, in fact I've since seen it in another sub-assy in the same database. This time it was with screws where I'd expect a small interference, but it showed the entirety of both parts as overlapping.

Unfortunately, we are not current on maintenance so I cannot send it to tech support to evaluate.

T

TomU

23-Emerald IV

Are you able to share the models? I can test it in the latest version of Creo, and I do have maintenance if necessary.

D

dgschaefer

Author

21-Topaz II

They are client models,i'd have to get permission to share them. I do have Creo 3 loaded, I can give them a try there to see if I get the same results.

D

dgschaefer

Author

21-Topaz II

OK, it seems that today, after shutting a restart of both Creo & my laptop, I cannot reproduce the issue in the the initial assy, but it remains in the other. No changes have been made in any of the components involved.

Here's a detail screenshot of the two parts, a screw (McMaster download) and a plastic panel:

Interestingly, the reported interference between multiple instances of the same screw is not identical, but very close. The volume of the panel is 0.629878, the volume of the screw is 0.001687. Combined volume is 0.631565. In the first occurrence the reported interference was exactly the combined volume of the two parts (both molded parts in that case), in this case it is not.